Sintered magnet and method for producing the sintered magnet
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United States of America Patent
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Mar 24, 2015
Grant Date -
Jan 31, 2013
app pub date -
Mar 31, 2011
filing date -
Mar 31, 2010
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Abstract
The present invention aims to ensure strength of a thin-walled sintered magnet. A sintered magnet is a ferrite sintered magnet made by sintering a magnetic material. A magnetic powder mixture obtained by mixing magnetic powder with a binder resin is injection-molded into a mold with a magnetic field applied thereto to produce a molded body, which is then sintered to produce the sintered magnet. The sintered magnet has a thickness of 3.5 mm or less in the position of center of gravity thereof. The sintered magnet has a surface roughness Rz of 0.1 μm or more and 2.5 μm or less. The surface roughness Rz is a 10 point average roughness.
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